Core-box used in the art of molding for metal-casting.



L. I. MILL'ARD. GORE BOX USED IN THE ART or MOLDING FOR METAL GASTING.

. APPLICATION FILED MAY 16, 1908 903, 102; Patented Nov. 3, 1908 LEO F.MILLARD, OF WHITEWATER, WISCONSIN.

CORE-BOX USED IN THE ART OF MOLDIl TG FOR METAL-CASTING.

Specification of LettersPatent.

Application filed May 16, 1908.

Patented Nov. 3, 1908.

Serial No. 433,332.

To all whom it may concern:

Be it known that I, LEO F. MILLARD, a citizen of the United States,residing at WVhitewater, in the county of WValworth and State ofWisconsin, (whose post-ofiice address is Whitewater, VVisconsim) haveinvented certain new and useful Improvements in Core-Boxes Used in theArt of l\Iolding for Metal-Casting, of which the following is aspecification.

My invention relates to boxes used in molding cores with depressions orcavities in them; and the objects of my invention are to provide a boxwhich can be firmly and conveniently held in place during the process ofmolding, and in which the interior projections, which produce thedepressions or cavities in the core, are automatically drawn out of thecore before the box is opened, thus insuring unbroken surfaces in andclean cut edges about the depressions or cavities made in the core. Iattain these objects by use of the mechanism illustrated in theaccompanying drawings in which,-

Figure l is a view of my improved core box with the several parts allheld together firmly and in proper position to receive material formolding a core; Fig. 2 is an exterior View of a longitudinal section ofthe box showing the automatic projections drawn out; Fig. 3 is aninterior view of a longitudinal section of the box showing the positionof the automatic projections on the interior surface of the box whenheld in position for molding as shown in Fig. 1; and, Fig. 4c is a Viewof one of the automatic projections detached from the box.

Similar letters refer to similar parts throughout the several views.

The core box A consists of a shell made of one or more parts, aa havingopenings L--b etc. through the shell through which the automaticprojections 0, 0 etc. work. These projections consist of a plunger d andaspring 6 Fig. 4E, fastened to the box by a screw f. When the box isclosed a clasp g is forced over the same holding the springs 6 down asshown in Fig. 1, in which case the plungers cl are pushed into the corechamber h and held in position as shown in Fig. 3.

The core chamber h is then filled with the molding material and whenproperly packed the clasp g is removed allowing the springs e to drawthe plunger (Z out of the core, when the box may be opened and the coreremoved Without interference from the proj ecting plungers.

I do not confine my invention to the particular form of constructionherein shown, but may use any shaped parts and any combinations ofmechanical parts by which substantially the same results are produced.

Having thus described my invention what I claim as new and desire tosecure by Letters Patent is A core box consisting of a shell composed ofone or more pieces having openings through which pieces, actuated bysprings, work to form interior projections all held together by asurrounding clasp, substantially as described and shown, for the usesand purposes mentioned.

LEO F. MILLARD.

Witnesses CHAS. INMAN, ED. HAHN.

